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2000 GTP Misfire

A

austin0404

New member
Okay so I just got a new GTP the mods are 3.4 pulley, pacesetter headers, 3" inch zzp exhaust, wizaird intake system, zzp tuned. I have a aeroforce scanner and i'm getting a misfire on cylinder #4 at idle. Now it goes away if you turn on A/C or accelerate. My scan gauge does not read any misfires under accelerating. I'm wondering if anyone would know why i'm getting these misfire?
 


No I'm not getting any check engine lights. Coils are new along with plugs. They are autolite 104s. I got injectors from zzp just stock but they were tested good before I got them
 


did this miss come after the plug change? if so you likely cracked the spark plug. swap it with the one next to it, see if the miss moves.

you might just see a black line in the plug too, then you know its cracked.

or you got a chipped piston.
 
Air/Fuel/Spark...

with misfire, swap plug (check gap too), wire, coil pack, then injector. Do this to see if the misfire follows, if so, you've found your problem. If not, then compression test, problem could be heads (valve) or worse, as Scotty says, a piston with a hole in it.

I'm going to bet coil pack ;)
 


It might vary some but 150-165ish give you take some.

So long as one cylinder is way low compared to the others, like if all are at 160 but cylinder 2 was at like 130 then you may have an issue.
 
Sorry scotty.. the car was my dad's he had it for 10 years. He meticulously took care of his vehicle(s). Each cylinder was reading 150 - 160.. also even after plug changes it's been doing it for the last year or so he hasn't figured it out.. it's a weird misfire..
 
I had constant misfires on cylinder 4 for about a year until I started getting other cylinder misfires and it turned out to be a crank sensor.
 
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